Are you using the 0.009" thick Bergquist SIL-PAD 400 insulators Glen?
I have repaired several amps that were built using the green colored, very rubbery insulators. Those tended to pierce through without much coaxing. All the edges around the screw ends of the TO-3s had pierced the insulator in the shape of the transistor end.
I have repaired several amps that were built using the green colored, very rubbery insulators. Those tended to pierce through without much coaxing. All the edges around the screw ends of the TO-3s had pierced the insulator in the shape of the transistor end.